./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4191541733 <...> DUID 00:04:e3:a1:4c:5b:a4:47:39:93:9a:5d:f6:69:14:97:a9:57 forked to background, child pid 4657 [ 36.063119][ T4658] 8021q: adding VLAN 0 to HW filter on device bond0 [ 36.093680][ T4658] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.15.216' (ECDSA) to the list of known hosts. execve("./syz-executor4191541733", ["./syz-executor4191541733"], 0x7fff73b4a5f0 /* 10 vars */) = 0 brk(NULL) = 0x555556783000 brk(0x555556783c40) = 0x555556783c40 arch_prctl(ARCH_SET_FS, 0x555556783300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor4191541733", 4096) = 28 brk(0x5555567a4c40) = 0x5555567a4c40 brk(0x5555567a5000) = 0x5555567a5000 mprotect(0x7f04d375e000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5082 attached , child_tidptr=0x5555567835d0) = 5082 [pid 5082] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5082] setpgid(0, 0) = 0 [pid 5082] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5082] write(3, "1000", 4) = 4 [pid 5082] close(3) = 0 [pid 5082] mkdir("./file0", 000) = 0 [pid 5082] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3 [pid 5082] socketpair(AF_UNIX, SOCK_STREAM, 0, [4, 5]) = 0 [pid 5082] ioctl(3, NBD_SET_SOCK, 4) = 0 [pid 5082] mount("/dev/nbd0", "./file0", "reiserfs", 0, NULL [pid 5081] kill(-5082, SIGKILL) = 0 [pid 5081] kill(5082, SIGKILL) = 0 [pid 5081] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5081] fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 [pid 5081] getdents64(3, 0x555556784620 /* 2 entries */, 32768) = 48 [pid 5081] getdents64(3, 0x555556784620 /* 0 entries */, 32768) = 0 [pid 5081] close(3) = 0 syzkaller login: [ 76.336730][ T7] cfg80211: failed to load regulatory.db [ 89.775864][ T990] block nbd0: Possible stuck request ffff88801eac0000: control (read@8192,4096B). Runtime 30 seconds [ 119.855392][ T990] block nbd0: Possible stuck request ffff88801eac0000: control (read@8192,4096B). Runtime 60 seconds [ 149.935355][ T990] block nbd0: Possible stuck request ffff88801eac0000: control (read@8192,4096B). Runtime 90 seconds [ 180.015386][ T990] block nbd0: Possible stuck request ffff88801eac0000: control (read@8192,4096B). Runtime 120 seconds [ 210.095352][ T990] block nbd0: Possible stuck request ffff88801eac0000: control (read@8192,4096B). Runtime 150 seconds [ 240.175466][ T990] block nbd0: Possible stuck request ffff88801eac0000: control (read@8192,4096B). Runtime 180 seconds [ 270.255352][ T990] block nbd0: Possible stuck request ffff88801eac0000: control (read@8192,4096B). Runtime 210 seconds [ 286.255373][ T28] INFO: task syz-executor419:5082 blocked for more than 143 seconds. [ 286.263562][ T28] Not tainted 6.2.0-next-20230223-syzkaller #0 [ 286.270428][ T28] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.279226][ T28] task:syz-executor419 state:D stack:27440 pid:5082 ppid:5081 flags:0x00004004 [ 286.288974][ T28] Call Trace: [ 286.292273][ T28] [ 286.295478][ T28] __schedule+0x24b4/0x5ac0 [ 286.300103][ T28] ? io_schedule_timeout+0x150/0x150 [ 286.305622][ T28] ? preempt_schedule_thunk+0x1a/0x20 [ 286.311075][ T28] ? preempt_schedule_common+0x45/0xb0 [ 286.316787][ T28] schedule+0xde/0x1a0 [ 286.320895][ T28] io_schedule+0xbe/0x130 [ 286.325431][ T28] bit_wait_io+0x16/0xe0 [ 286.329707][ T28] __wait_on_bit+0x64/0x180 [ 286.334220][ T28] ? out_of_line_wait_on_bit_timeout+0x170/0x170 [ 286.340801][ T28] out_of_line_wait_on_bit+0xd9/0x110 [ 286.346361][ T28] ? __wait_on_bit+0x180/0x180 [ 286.351163][ T28] ? group_init+0x6b0/0x6b0 [ 286.355863][ T28] __bread_gfp+0x29e/0x330 [ 286.360371][ T28] read_super_block+0x83/0x930 [ 286.365287][ T28] reiserfs_fill_super+0x75a/0x2ea0 [ 286.370531][ T28] ? reiserfs_remount+0x1650/0x1650 [ 286.375785][ T28] ? sget+0x47b/0x580 [ 286.379840][ T28] ? snprintf+0xbf/0x100 [ 286.384090][ T28] ? vsprintf+0x30/0x30 [ 286.388582][ T28] ? wait_for_completion_io_timeout+0x20/0x20 [ 286.394695][ T28] ? up_write+0x1b4/0x520 [ 286.399243][ T28] mount_bdev+0x351/0x410 [ 286.403620][ T28] ? reiserfs_remount+0x1650/0x1650 [ 286.408921][ T28] ? reiserfs_kill_sb+0x1e0/0x1e0 [ 286.413980][ T28] legacy_get_tree+0x109/0x220 [ 286.418828][ T28] vfs_get_tree+0x8d/0x350 [ 286.423273][ T28] path_mount+0x1342/0x1e40 [ 286.427892][ T28] ? kmem_cache_free+0xec/0x4e0 [ 286.432836][ T28] ? finish_automount+0x9b0/0x9b0 [ 286.437926][ T28] ? putname+0x102/0x140 [ 286.442247][ T28] __x64_sys_mount+0x283/0x300 [ 286.447132][ T28] ? copy_mnt_ns+0xb30/0xb30 [ 286.451772][ T28] ? lockdep_hardirqs_on+0x7d/0x100 [ 286.457386][ T28] ? _raw_spin_unlock_irq+0x2e/0x50 [ 286.462612][ T28] ? ptrace_notify+0xfe/0x140 [ 286.467432][ T28] do_syscall_64+0x39/0xb0 [ 286.471875][ T28] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 286.477849][ T28] RIP: 0033:0x7f04d36f13d9 [ 286.482280][ T28] RSP: 002b:00007ffed770c1a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 286.490757][ T28] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f04d36f13d9 [ 286.499001][ T28] RDX: 00000000200003c0 RSI: 0000000020000380 RDI: 0000000020000340 [ 286.507039][ T28] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffed770c348 [ 286.515055][ T28] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f04d36b06f0 [ 286.523127][ T28] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 286.531224][ T28] [ 286.534279][ T28] [ 286.534279][ T28] Showing all locks held in the system: [ 286.542075][ T28] 1 lock held by rcu_tasks_kthre/12: [ 286.547408][ T28] #0: ffffffff8c796bf0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 [ 286.557975][ T28] 1 lock held by rcu_tasks_trace/13: [ 286.563270][ T28] #0: ffffffff8c7968f0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 [ 286.574750][ T28] 1 lock held by khungtaskd/28: [ 286.579660][ T28] #0: ffffffff8c797740 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x390 [ 286.589661][ T28] 2 locks held by getty/4758: [ 286.594351][ T28] #0: ffff88802c224098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 [ 286.604241][ T28] #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 [ 286.614435][ T28] 1 lock held by syz-executor419/5082: [ 286.619928][ T28] #0: ffff88807bbce0e0 (&type->s_umount_key#25/1){+.+.}-{3:3}, at: alloc_super+0x22e/0xb60 [ 286.630186][ T28] [ 286.632511][ T28] ============================================= [ 286.632511][ T28] [ 286.640951][ T28] NMI backtrace for cpu 0 [ 286.645313][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-next-20230223-syzkaller #0 [ 286.654283][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 [ 286.664435][ T28] Call Trace: [ 286.667721][ T28] [ 286.670685][ T28] dump_stack_lvl+0xd9/0x150 [ 286.675364][ T28] nmi_cpu_backtrace+0x316/0x3e0 [ 286.680331][ T28] nmi_trigger_cpumask_backtrace+0x3a7/0x460 [ 286.686340][ T28] ? lapic_can_unplug_cpu+0xa0/0xa0 [ 286.691584][ T28] watchdog+0xe94/0x11e0 [ 286.695883][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 286.701884][ T28] kthread+0x2e8/0x3a0 [ 286.705999][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 286.711654][ T28] ret_from_fork+0x1f/0x30 [ 286.716148][ T28] [ 286.719595][ T28] Sending NMI from CPU 0 to CPUs 1: [ 286.724842][ C1] NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x40/0x50 [ 286.725860][ T28] Kernel panic - not syncing: hung_task: blocked tasks [ 286.725872][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-next-20230223-syzkaller #0 [ 286.725899][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 [ 286.725913][ T28] Call Trace: [ 286.725920][ T28] [ 286.725929][ T28] dump_stack_lvl+0xd9/0x150 [ 286.725970][ T28] panic+0x61b/0x6c0 [ 286.726062][ T28] ? panic_smp_self_stop+0x90/0x90 [ 286.726100][ T28] ? preempt_schedule_thunk+0x1a/0x20 [ 286.726152][ T28] ? watchdog+0xc20/0x11e0 [ 286.726186][ T28] watchdog+0xc31/0x11e0 [ 286.726218][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 286.726251][ T28] kthread+0x2e8/0x3a0 [ 286.726279][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 286.726313][ T28] ret_from_fork+0x1f/0x30 [ 286.726362][ T28] [ 286.733447][ T28] Kernel Offset: disabled [ 286.820179][ T28] Rebooting in 86400 seconds..